Denny Adler and Son's replaced our roof and laid a Duro Last membrane (Denny is a "Duro Last specialist") over plywood without any insulation. I'm sure it saved him $. Thus, 5 years into the 20 Year Warranty, the roof was already starting to show water spots. He was out a few times to patch, but who knew due to condensation( lack of insulation between the heat/cool in the house and the outdoor air), the plywood "subfloor" was rotting out. When we called Adler, he came out and said that the roof was fine and he could patch a few areas. With a 2nd,3rd and even 4th opinion, we learned the roof was trash. I called the Duro Last rep in Columbus, Mike Gottron and he said he would look into it. I guess the 2 of them are buddies and he said that the roof was fine. So we had the ceiling ripped out at our expense and the roof was not ok. The boards were covered in mold and you could see daylight through the membrane. They called out the Duro-Last inspector and he fell through the rotten wood but still claimed that it wasn't their problem. I could go on, but as not to bore anyone, the job was shotty, the product was shotty and neither stood by their guarantee.